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Human Reproduction Test - 24

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Human Reproduction Test - 24
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  • Question 1
    1 / -0
    About which day in a normal menstrual cycle does rapid secretion of LH (popularly called LH-surge) normally occurs?
    Solution
    For women with a 28-day cycle, the 14$$^{th}$$ day is often the day of ovulation. A surge or sudden release of LH causes ovulation, the release of a mature ovum from the dominant ovarian follicle. After ovulation, LH stimulates the empty follicle to develop into the corpus luteum. 
  • Question 2
    1 / -0
    The secretory phase in the human menstrual cycle is also called
    Solution
    Correct Option: B
    Explanation: 
    • The menstrual cycle is complex and controlled by many different glands and the hormones that these glands produce. 
    • The four phases of the menstrual cycle are: menstruation, the follicular phase, ovulation and the luteal phase.
    • The secretory / luteal phase begins after ovulation. It lasts about 13- 14 days (unless fertilization occurs) and ends just before a menstrual period. In this phase, the ruptured follicle closes after releasing the egg and forms a structure called a corpus luteum, which produces increasing quantities of progesterone.
  • Question 3
    1 / -0
    Which of the following cells during gametogenesis is normally diploid?
    Solution
    Spermatogonia are diploid germ cells of seminiferous tubules that undergo mitosis to form the primary spermatocytes. These primary spermatocytes are coverted to haploid sperms by meiotic of division
    So, the correct answer is option A.

  • Question 4
    1 / -0
    Which of the following depicts the correct pathway of transport of sperms?
    Solution
    (A) Correct option (C)
    (B) Explanation of correct answer:

    • The sperms are transported from the rete testis to the epididymis through efferent ductules.
    • The sperms mature while being stored in epididymis.
    • When stimulated, the mature sperms are transported into the vas deferens through smooth muscle contractions.
    • Hence, the correct answer is 'Rete testis → Efferent ductules → Epididymis → Vas deferens
  • Question 5
    1 / -0
    Secretions from which one of the following are rich in fructose, calcium and some enzymes?
    Solution

     Solution:

    Correct answer is option B.

    Explanation for correct option:

    • Semen, also called seminal fluid, fluid that is emitted from the male reproductive tract and that contains sperm cells. 46 to 80 per cent of the fluid is produced by the seminal vesicles.
    • Semen contains citric acid, free amino acids, fructose, enzymes, phosphorylcholine, prostaglandin, potassium, and zinc.
    • Semen also contains liquids that combine to form seminal plasma, which helps keep the sperm cells viable. 
    • The seminal plasma is rich in fructose, calcium, ascorbic acid, and certain enzymes.

  • Question 6
    1 / -0
    Select the correct sequence for transport of sperm cells in male reproductive system.
    Solution
    Correct Option: B
    Explanation: 

    Sperms are produced in the seminiferous tubules of testes. 
    Seminiferous tubules open into the vasa efferentia via the rete testis.
     Following this, the vasa efferentia open into the epididymis which further leads to the vas deferens. 
    The sperms, from vas deferens, pass onto the ejaculatory duct which opens into the Urethra. 
    The urethra extends through the penis to the external opening known as Urethral Meatus. 
    Hence, the correct option is B
  • Question 7
    1 / -0
    Identify the human development stage shown, as well as the related right place of its occurrence in a normal pregnant women and select the right option for the two together.

    Solution
    Implantation occurs on uterine wall in blastula stage and human blastula is called as blastocyst.
    So, the correct answer is 'Development stage - blastocyst; Site of occurrence - uterine wall'
  • Question 8
    1 / -0
    What is the correct sequence of sperm formation?
    Solution
    In spermatogenesis, spermatozoa are produced by the mitosis and meiosis division of male primordial germ cells. The initial cells are spermatogonia, which produces primary spermatocytes by mitosis. The primary spermatocyte divides meiotically (meiosis I) into two secondary spermatocytes, each secondary spermatocyte divides into two spermatids by meiosis II. These develop into mature spermatozoa, also known as sperm cells. Thus, the primary spermatocyte gives rise to two cells, the secondary spermatocytes, and the two secondary spermatocytes by their subdivision produce four spermatozoa. Thus, the correct answer is option D.
  • Question 9
    1 / -0
    The difference between spermiogenesis and spermiation is 
    Solution
    Spermiation is the release of spermatids from the Sertoli cells into the seminiferous tubules. This is followed by spermiogenesis which is release of spermatozoa or mature sperms. This is the last step of spermatogenesis. 
    Thus, the correct answer is option C. 
  • Question 10
    1 / -0
    Immediately after ovulation, the mammalian egg is covered by a membrane, called as
    Solution
    The corona radiata is adjacent to the zona pellucida, the outer protective layer of the ovum. It provides nutrients to the developing ovum. It binds spermatozoa and is required to initiate the acrosome reaction. Hence, immediately after ovulation, the mammalian egg is covered by the corona radiata membrane.
    So, the correct answer is option C.
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